Question:
What is the effect of humidity on sound waves when humidity increases?
What is the effect of humidity on sound waves when humidity increases?
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Moist air is less dense, so sound travels faster.
Updated On: Oct 1, 2026
- Speed of sound waves is more.
- Speed of sound waves is less.
- Speed of sound waves remains same.
- Speed of sound waves becomes zero.
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The Correct Option is A
Solution and Explanation
Step 1: Reason
Water vapour (molar mass \(18\)) replaces heavier nitrogen and oxygen (molar mass \(28\) and \(32\)) in air. So humid air has lower density.
Speed of sound is \(v=\sqrt{\frac{\gamma P}{\rho}}\), so lower density gives a higher speed. Option (A).
Final Answer:
Speed of sound increases, option (A). \[ \boxed{\text{(A)}} \]
Water vapour (molar mass \(18\)) replaces heavier nitrogen and oxygen (molar mass \(28\) and \(32\)) in air. So humid air has lower density.
Speed of sound is \(v=\sqrt{\frac{\gamma P}{\rho}}\), so lower density gives a higher speed. Option (A).
Final Answer:
Speed of sound increases, option (A). \[ \boxed{\text{(A)}} \]
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